RHEL6 reset root passwd

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Enter your boot loader’s menu (ulazi se sa tasterom “Del”).
Highlight your normal boot option.
Press “e” to enter edit mode.
Highlight the line starting with word “kernel” or “linux”.
Press “e”.
Add the word ‘single’ at the end. (don’t forget to prepend a space!)
Press Enter and boot the edited stanza (pritiskom na taster “b”).

Your system will boot up in single user mode. You’re root now. Change your password.